Trimming attachment for machines for sewing knit fabrics



(No Model.) 2 Sheets-Sheet 1.

E. H. BROWN. TRIMMING ATTACHMENT FDR MACHINES FOR SEWING KNIT FABRICS.

No. 406,424. Patented July 9, 1889.

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Patented July 9, 1889.v

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TRIMMING ATTACHMENT FOR MACHINES FOR SEWING KNIT FABRICS.

UNITED STATES '1 ATENT FFICE.

EUGENE H. snowmen BENNINGTON, VERMONT.

TRIMMING ATTACHMENT FOR MACHINES FOR SEWING KNIT FABRICS.

SPECIFICATION forming part of Letters Patent No. 406,424, dated July 9,1889.

Application filed April 29, 1889.

To all whom it may concern.-

Be it known that I, EUGENE H. BROWN, a citizen of the United States,residing at Bennington, in the county of Bennington and State ofVermont, have invented a new and useful Improvement in TrimmingAttachments for Machines for Sewing Knit Fabrics, of which the followingis a specification.

My invention relates to improvements in appliances for trimming seams inknit fabrics, in which circular revolving cutters are driven by a systemof ratchets, pawls, and levers, as hereinafter described, and isespecially applicable to looping-machines.

The object of my invention is to provide an actuating connection betweenthe oscillating needle-arm shaft and a pair of circular rotary cutters,whereby an intermittent rotary motion will be imparted to such cutters.I attain these objects by the mechanism illustrated in the accompanyingdrawings, in which- Figure 1 is a plan view of so much of a machine forsewing looped fabrics as is necessary to illustrate my invention. Fig. 2is a side View of the device. Fig. 3 is a front view of the same. Fig. 4is a vertical section taken on the line 1 2 of Fig. 1 for the purpose ofshowing the construction of the knives and the supporting devices withall other parts removed.

Similar letters refer to like parts in the several views.

The devices are mounted on an iron bedplate P, which is fastened to thetable Q of the machine by means of a bolt S passing through an elongatedslot t, whereby it is made adjustable. The bed-plate P is provided withtwo upright sockets W and X, which constitute bearings for the shafts qand p of the rotary disk-cutters L and M. The

cutter M has a threaded hole in its center and screws onto the end ofthe shaft 19, which is threaded to receive it. The shaft p is providedat its upper end with a vertically-adjust-able collar r, which is heldin position by a set-screw 01., thus preventing the dropping of thecutter M. The cutter L is fastened to its shaft q in the same manner asdescribed for the cutter M. The center of the socket W, whichconstitutes a bearing for the shaft q of the cutter L, is inclined fromthe plane of Serial No. 308,920. (No model.)

the center of the socket X, which constitutes a bearing for the shaft pof the cutter M at an angle of two degrees in the forward direction ofthe cut, so as to make a single shearing contact at the point V, andthus cause the wear on the cutters to tend constantly to the attainmentof a cutting-edge. The socket TV is threadedat its upper end, and hasscrewed therein a plug m,between which and the end of the shaft q of thecutter L is the pushspring Z, which holds the cutter L firmly againstthe cutter M.

Above the cutters L M on the shafts q and p are the right and left handratchets J and K, which are respectively integral with q and p. Theratchets K and J are rotated by the pawls G and H, which are pivoted bythe pins a and b to the arm D of the lever E, and are also mutuallyconnected by the retractile spring k. This lever is pivoted on thecenter 0, and is swung one way by the finger O and is returned toposition by the retractile spring F, attached to the hook d of thestationary bed-plate. The finger C is longitudinally adj ustable on thearm B, which is longitudinally adjustable on the oscillating shaft A.The shaft A also carries the needle-arm, which is not here shown, as itis not essential to the understanding of the invention.

The operation of the devices is as follows: The parts of the fabric arelooped onto the points of the looper-wheel in the usual way. As thewheel revolves from right to left, the selvages, projecting upwardlyabove the points, pass by guard U and are sheared off by the cutters,the waste passing outthrough the channel O. The trimmed edge then passeson under the looper-needle. (N 0t shown.) As the shaftA is rocked tooscillate the needle, the finger O is correspondingly vibrated, and ateach stroke impinges against the arm D of lever E, and thereby causesthe same to swing on its pivot c. This movement forces the pawls againstthe ratchets, thus causing a partial rotation of the cutters. The returnmovement of the lever E is effected by the spring F, which, byretraction, swings the lever E back into its original position toreceive another impulse from the finger C.

The width of selvage is determined by means of rib a on the bottom ofstand-plate P,

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set-screws f g, and bolt S, the plate bearing only on the rib u and thepoints of the screws f and g.

I therefore claim as my invention and desire to secure by Letters Patent5 1. The combination, in machines for trimming the seams of knitfabrics, of the finger 11, connected with the oscillating needle-arm,the lever DE, pivoted as shown, and the retractile spring F, attached tothe end thereof IO and fastened at the other end to the bed'plate foreifecting the back-stroke of the lever I) E, with the pawls H G,connected by the spring is, the ratchets K J, and the rotary cutters LM, when arranged to operate substantially in

